package com.itheima.service;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.itheima.entity.Result;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.web.authentication.AuthenticationFailureHandler;
import org.springframework.stereotype.Component;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@Component("authenticationFailureHandlerService")
public class AuthenticationFailureHandlerService implements AuthenticationFailureHandler {
    @Override
    public void onAuthenticationFailure(HttpServletRequest request, HttpServletResponse response, AuthenticationException e) throws IOException, ServletException {
        response.setContentType("application/json;charset=utf-8");
        PrintWriter writer = response.getWriter();

        Result result;
        if (e instanceof UsernameNotFoundException || e instanceof BadCredentialsException) {
            result = new Result(false,e.getMessage());
        } else {
            result = new Result(false,"登录失败！");
        }
        writer.write(new ObjectMapper().writeValueAsString(result));
        writer.flush();
        writer.close();
    }
}
